Roasting-furnace.



PATENTED JUNE 12, 1906. A. W. CHASE. ROASTING FURNACB.

APPLIGATIO FILED JULY 1,190`3.

6 SHEETS-SHEET 1.

Mummy No. 823,393.k

PATENTED JUNE 12, 1906. A. W. CHASE. ROASTING FURNAGE. APPLICATION FILEDJULYl, 1903,

6 SHEETS-SHEET 2.

Q/vihwooea No. 823,393. PATENTED JUNE l2, 1906.

A. W. CHASE. ROASTING PURNACE.

APPLICATION FILED JULY 1, 1903.

` 6 SHEETS-SHEET s.

PATENTED JUNE'1z,19o6. A. vmms;v ROASTING FURNACB.

APPLICATION FILED JULY 1. 1903.

e MEETS-SHEET 4.

|| llll llllrllll No. 823,393. PATENTED JUNBlZ, 197046.

A IVW-CHASE, ROASTING PURNAOB;

APPLICATION IILBD JULY 1. 1903. I

' e SHEETS-SHEET 6.

fi. W/zws.

@mi humaan UNITED STATES PATEN T oEEIoE.

' ARTHUR w. cHASE, or NEW YORK, N. Y.

RoAsTlNG-FURNAQE.

To all whom' it may concern.'

Be it knownthatl, ARTHUR W. CHASE, a

citizen of the lUnited States, residing at New York, in the county ofvNew York `and State of New York, have invented certain new and usefulImprovements. in Roasting-Furnaces;

and I do hereby declarethe following to be a full, clear, andexactdescription of the invention, such as will enableV others skilled in theart to which it the same. j

My invention relates tov improvements` in roasting-furnaces,although'itmay also Abe used as a dryiig, chloridizing, and calciningfurnace as well.

appertains to make and use The objects of my invention are to produceafurnace of greater eiciency than the fur- 2 5 atory furnace with sli htchanges in construcf tion, and one thatwi l variety'of ores. L

'y .tions of nace, now in common use' forroasting 'purposes', one thatmay be operated at a' lower l cost and at a minimum expense for repairs.

Further objects are to produce a furnace in which the ore may be roastedtoa dead roast or to `a roast sufficientfor smelting purposes, as maybey desired, one that may be used. either as a mufflefurnace o'r areverbereflciently reas/ t every With these objects in view my--invention consists lin the construction and combinaparts,l ashereinafter'described and claimed. A

In the-accompanying drawings, Figure l is a longitudinal section. of myimproved furnace, parts beingremoved. Fig. 2 is an end view,partly incross-section, of two of Amy furnaces built si'de by side. j Fig. 3 is aside view of my'improved furnacefa part being shown in cross-section toshow the construction of the flues. Fig. 4; is a horizontal sectiontaken on the line 4 .4 of Fi 2. Fig. 5 is a horizontal ysection of two omy furnaces built side by. side, Athe ls ection of oner furnace beingtakenon thefline A'A, Fig` 1, andthe section of the other furnace beingtaken on the line B B of the same figure. Fig. 6 1s a vertical section,on an enlargedscale, ofthe feeding part of my device, which may also beused as a drier. This figure'is taken looking from the opposite .side of"said feeder from whatis shown in Fig. 1, and'Fig. 7 is an end view oftwo of my furnaces built side by side vand showing in dotted lines themeans for driving" y the` conveyers and the supportingframeforthemasonry structure. My improved furnace is composed of units,

specification of Letters Patent.

ipplication filed July l, 1903. Serial No. 163,919.

Patented June 12,1906.

although-for convenience I usuallybuild at least two of these furnacesside by side, making use of one chimney for both furnaces. I do notrestrict. myself to this arrangement,

however, as my furnace `can be built Aas large each unit being acomplete furnace in itself, l

as desired by combining any number of units i together arranged side byside. a represents a hopperof metal which is supported, by, means ofbraces 6, directl upon the brickwork of the furnace..y This hopperdelivers into the top of the throat c of Y .the combined feeder anddrier, an iron collar d beingV preferably used at ,the point where thehopper and the throat meet.- The throat c delivers into a cylindricalchamber e, which is provided with a discharge throat or pipe f. Theparts c, e, and f are made of a single piece of cast-iron, insuringvgreat strength and rigidity. The ends of the cylindrical chamber e areclosed bylend pieces g and 71 being secured thereto by bolts (not shown)or in-any,

other suitable way. These end pieces g andh mineral wool, or othersuitable heat-resistingl repre-. sent end pieces for the purpose of holin thev anddust-catching material. o and packing in place, these beingperforate for the y passage of 'the conveyer-,shaft These end pieces maybe extended, as shown at g in Fig. 6, for the sake of giving anadditional extended bearing to the conveyer-shaft, or'

they may be simple plates, 'as shown on the left of Fig. 6. Theyare'securedt'o the parte gland h by bolts (not shown) or in any othersuitable way.

Within the chambere is a conveyer consisting of a shaft r, upon which ismounted a 'Spiral conveyer s. This spiral conveyer is made up ofsections, as shown in Fig. 6, any fone of which maybe easily removed forrepairs. The conveyer-shaft r is hollow and is cooled by water passingthrough it', .the water being delivered at one end thereofand'passingout at the other, as clearl 'shown in Fi 1. The shaft r is providedywith suitab e 'stuffing-boxes u, oneat each end, and screwthreadedprojections@ are provided, to which flexible'pipes wand (see Fig. 1)-maybe IIO cated the brickarch t, ,(see Eig-2,)

a-recess in-the end wa l yof the furnace .fand r` .ofthe-unit furnacesfor :the purpose ofrescrewed. The wholel feeding -device islloresting onthe top of the furnace. The discharge-pipe f passes down into.a.ver.tica1ly arranged pipe y, which delivers into the top ofthe'upperroastin -trough z. w. y

l'""r[`hepipe y, as wel ,as the roasting-troughs, 1s ma e of`carefully-Selectedv and p .-clay.V .Said pipe ispi'ovided at lts upperend with a projectlng li 1, which enter'sinto also rests-upon the brick-arch 2,- 'whichds sprung across between theside walls-of the v .furnaceThe lower' end of the .pipe g/fits into a perforated -ire-cla platev 3,.whichisy l providedwith a lip 4, W 'ch surrounds-the pipe y onthreesides. The Iplate 3 rests upon j .Iss

1.- and-.is supported by the trough 2. lThe trough z, as. Well. as theother .roasting- -tioughsfis substantially but noteXactlyU`shaped.in:crosssection-fthatis, ithas a circularfbottorn; but the sidesthereof are .not vertical,.:but are splayed outwardly, thereby screwconveyer ymeans yof theadjustable bearin sito .give the screw greaterclearance venabling. the ogerator by.- .ralsing any,4 yone z5 from .t e.bottomand sidesrof the trough i -should defects in the form ofthe-trough due.

to...defective manufacturing ycause the screw torbind. v Within thetrough z isa spiral conveyer 6,

'L .carriedon the hollow shaft-Which is provided with stuffing-boxes-andcooled by a current of. water flowing through .Saidshaftf as has 455:already .been .describedl in connection with the conveyer-shaft of thefeeder. 'All fouro'f the conveyer-shaftslare ofgsimilar-rconstruc- .tionand, together with the feeder`shaft,.are

supported in bearings carried-on independent `supports 7 .and 8,arrangedoutside of th'e'furVF .naceyso as to be substantially free-fromyth Y v.expansion and contraction that would ensue' 1f they weredirectly attached to the'walls of the furnace. .In Fig. 6 is shown .oneform-.of

a dust-excluding.. bearing,which :has already lbeen described; but Iprefer to. use; in addltionto 'said bearing a secondbearing. 9 out'-side :of .the mainA ,bearing and .preferably 1 yslightly. smaller,'whichbearing is filled with Waste 1()y adaptedto besaturatedl with,oil. eln Fig. l all. the; shaftsare shown as provided with this doublebearing. The...orefroasting 'troughs'.are made. of carefully-selectedfire'- cla ,and the entire interior iszmade of care.- fuly-seleeteddirebrick and fire-clay. forms. The outer Walls may beeitherplain .brick or. fire-brick, as preferred.

. ,Below the. series of roasting-troughs which are arranged in verticalseries .one above: the otheris a shelf 14, whichfseparates the .fireboXfrom the roastingrtroug-hs. Asimilar shelf 15 .is providedabove-the-.toproastingtroughs z, and by means of these. shelves. the ireand products of combustioniareykeptsentirely apart.. from theroasting-troughathus.

prepared f in -troughsl ceases products of combustion therefrom pass up'through the iues 16 and 17;'located at op o- .site-corners of the frontof the furnace. T ey then pass over the shelf. 15 through the passage 18vand out through the chimney 19.

' The passage 20v (shown in Fig.. l) is a passage connecting the toppassage or iiue of one furnace with that of-a similar furnace next inline and ma Abe vclosed by a .damper or briched up w 'en itis desired tocutout one .pairs, .for example. On the. shelf 14 rest fireclay..archesc23,`.made.1f of .fire-.clay and on ywh1ch--the..lowest roastingftroughI13 rests.

Onthe. .braces 23 are. fire-.clay 4blocks 24 .and '25,. which. supportaseries of fire-clay arches 26,.. which.. support the roasting-trough.12, and'this construction is continued. all ..the wayup ,thefurnace lThe spiral conveyers infthe various roast- ;.ing-troughs are .revolvedin opposite directions successively, so that the o re is fed for- 'wardthrough one, back through the nekt lower'trough,A forward through thenext lower trough,l and soon. At. theend of each trough aredischargapipes 27, 28., 29,.and 3Q made :of're-clay. All `of theselexcept the .lowest one .are similarinconstruction and 95 each consistsof a pipe provided with an outwardlyfprojecting `lip entering a recessin the wall of the furnace and being cut away above to fit around thetrough just above itand beling cut away below to fit-upon a ledge in thesupporting-plates 31, 32, and 33, which rest upon the troughs 11, 12,and 13, respectively. `Below the shelf 14 is the fire-box 34, pro--Avided with a grate 35`and a charging-door-S.

Beneaththe ate 35 is an ash-pit 37, provided with a ischarging-door 38.Adjacenty tothe grate 35 isan inclined floor 39, and this `floor .Brplate 39 and the bottom ofthe ash- IOO IOS

ypit are made 'of Vfire-clay, though they may be made of other vmaterialin s ecial cases. The

`bottom 'of the ash-.pit .an the plate 39 are supported in the sidewalls ofthe furnace, and .the bottom of the furnace 40 rests upon a.concrete foundation 41, which affords a firm and stable base to thewhole structure. A

.shortndistance .above the vbottom 40 of the .furnaceis an-firon .plate.42, separated lfrom -thebottomand oneendl ofthe furnace by a IIS I -deiver .airftothe lowest trough 13. The

paired-fines 48, 49', and 50 deliver' air above the roastingftrough 11,and thepaired flues 51..'andg52'deliver air above the roasting# ntroughz. Of course it is-understood that paired ues..are 'provided for veach:of said roasting-troughs, but -to avoid confusion said troughs shouldhappen to b ecome crackedor broken.

Peep-holes are provided at various places in the sides of the furnace.One of these is shownat 53 in 2 and is adapted tofbe closed by a brick54. These peep-holes are preferably-arranged so that each 'trough may beseparately inspected-that is to say, .peepholes are provided just aboveeach trough v and just above the-shelf`15.

ing .up the flues 16 andslgrj The flame and vproducts'of combustion fromthe fire-box will thenV rise directly around the roastingtroughs andpass out thrgugh the chimney 19.

Any desiredmeans Til? heat may be used in the fire-box, whether wood;coal, or gasf In manyl instances after the ore has once become hot theheat generated by the combustion of the ore itself is su'liicient tomaintain the roasting operation until it has been completed.

In the type of furnace shown in Fig. 1 the gases evolved from theroasted ore for the purpose of making sulfuric acid are shown as passingoutthrough discharge-pipe 55, which is located underneath the lowest.trough 13.

i It should be noted that the space beneath the arch t is subjectedtothe action of the hot gases evolved from the roasted ore, inasmuchas'said gases can pass freely through the pipe y up into the spacebeneath said arch. These hot gases, which play around the tube aand thepipes c andf, heat them to a considerable degree, thus rendering thepipe e a drier. .'The conveyer s prevents any `appreciable 'amount ofsaid gases from escaping up through the pipe c out through Athe openhopper a, and this is especially the case whenas is-usual in actualvoperation the pipe c is filled with ore. The hot gases from' theroasted ore come up through the pipe 'y and surround theftube e; andheat it, thereby becoming cool when they fall back through the pi-pe yinto th'e main portion of the furnace.

In muffle-roasting,generally speaking, the

`gases arising from the -burmng or chemical changes in the orepass outthrough the pipe -y and over and around the feeding and dry- 'ing deviceand thence 1to the chambers or flues through' an opening back of theheating from the spirit of my invention but device through a passage,(not shown on the drawings,) thereby utilizing the heat of'these gasesto dryfand heat the incoming ore. The drying-chamber thus becomes a veryefficient dust-chamber. I

It vis important thatv the conveyer-shafts 'which pass through theroasting-troughs should not become warped or bent by the heating andcooling 4ofthe furnace. This is accomplished, as has already beendescribed, by having these shafts water-cooled and by having thebearings therefor mounted in supports entirely separated from thefurnace proper. f

The ends of the furnace are providedwith openings which are closed byplates 79. These plates have circular openings cut in them a littlelarger than the conveyer-shafts. Angle-irons 56 and57 are secured tothese plates 79 and to the end. of the furnaceby bolts 80, which passthrough said plates and into the wall of thefurnace. Between theseangle-irons and the side of the furnace separate plates, such as 5S, 59,and 60,. are secured, and these plates are cutaway at their meetingedges for the passage of the conveyershaft-that is to say, each of theplates, which fit around the conveyer-shafts are made two sections whichare adjustably secured togetherby plates, such as 61, secured by bolts81, the holes through which said bolts S1 pass being larger than thebolts themselves, so that an ,exact adjustment may be obtained. Thestuffing-boxes pass into the plates 61. In this way the conveyershaftsare practically entirely independent of the closing-plates, which arefree to expand or-contract under the heating-and cooling of courseoccurs on both ends of the furnace.

Tie-bolts such as 75, 76, and 78 pass through the walls of the furnace.The supporting-frame for the driving-gear 63, 64, 65, 66, 67, 68, and'69is shown in'Fig. 7.

The conveyer-shafts in the various roasting-troughs are arranged totravel at different rates of speeding, increasing from the IOO vthefurnace. This'arrangement of plates of IIO top downward, the conveyer inthe top roasting trough moving the slowest, 'while the conveyer in thelowest roasting-trough moves the fastest. This is desirable .in order toprevent any possible clogging of the ore in the roasting-trough, and ises ecially desirable in order to lessen the dept 1 of ore in thesuccessive troughs, and thereby increase the roasting-surfaces exposedto action. This is accomplished byfhaving the sprockets u on theconveyer-shaft of different sizes, an in Fig. 7 are shown in dottedlines sprocketdrives for accomplishing this result.

While I have thus described my invention,

I' do not wish to be limited to the exact details shown and described,inasmuch as many of them mighty be varied without departing What I claimas. new, and desire to secureby: Letters Patent of the UnitedStates, is-

'flfIn a roasting-furnace, the combination of end walls provided withopenings, bridgel f l"Walls, a series of substantially U-sha'ped troughssupported within said end walls, con-,

veyers in saidl troughs, means for driving said conveyers; afplateprovided with circular openings adapted to lit around theopenings in theend walls, said plate being prov i ed with slots and'removableplateseach l made in two sections fitting around the conveyer-shafts andadapted to close the openings in the endwalls, said plates beingadjustably secured to .the first-named plate, substantially asdescribed.

2. In a roasting-furnace, the combination of the furnace roper, ametallic ho-pier sup.

ported on sai furnace, a .combine feeder and d-rler provided wlth flangeresting` on said furnace, a conve erln said feeder and drier, awatencooled s aft for said conveyer,

' and gas-check devices, said hopper and the [iron feeder and drier beinof roasting-troughs arranged one above the able shelves' where? usedeither as a mu other, conveyers in saidtroughs, and remov said furnacemay be e-furnace or asa rever beratory furnace, substantially asdescribed. 4. In a roasting-furnace, the combination g of end walls,sidewalls, roasting-troughs sup orted between said walls, removableshelves i ocated one above said roasting-troughs and 4o one below thesame, thereby shielding said trou hs from direct contactwith theheatsupp ying means, and means for delivering a1r to saidroasting-troughs, substantially as described.

` 5. Ina roasting-furnace, the lcombination of end walls, side walls,roasting-troughs secured between saidwalls, a fire-box,removable-shelves,l one located above said roastingtroughs and one belowthe same, means for 'conveying the flame and products of combustion fromsaid nre-box around' said roastingtroughs, and means'for su plying airto said A troughs, substantially as ascribed.

6. In a'roasting-furnace, the combination of end walls, side w-alls,roasting-troughs sup ported between said walls, a fire-boX, removable'shelves above and below said' troughs, 4means for supplyi'I-ig vair tosaid drier located aboveone of said roastingtrbughs, substantially asdescribed.

7. In a roastin -furnae, the combination of end walls, si e walls,roasting-troughs therein, a conveyer in eachof said'` troughs, shelveslocated one above said troughs and the other below the same therebyshielding said troughs from the direct action of the heating means, acombined feeder and drier for said troughs, said feeder and drier beingshielded from the direct action of the heating means but being exposedto the action ofthe heated gases evolved from the roasting ore, andmeans for carrying off said gases, substantially as described. 8. In aroasting-furnace, the vcombination of end walls, side walls, a fire-box,a shelf located directlyabove said iire-box, roastingtroughsllocatedabove said shelf, a conveyer in each of saidroasting-troughs,dischargepip-es for said roasting-troughs, a shelfcated above said roasting-troughs, said shelves serving to shield saidroastingtroughs from the direct action of the heating means, means fordelivering air to said roasting-troughs, and means forcarrying theproducts of combustionv from the fire-boxaround said troughs,-substantially as def scribed.

In testimony whereof I aiiix my signature in presence of two witnesses.Y

. ARTHUR W. CHASE. Witnesses:

J. STEPHEN EINsTA, FRED W. ENGLERT.

.roasting-troughs, and a combined feeder and

